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Chemical Reactions (no balancing)

Total questions: 32

Worksheet time: 22mins

Name
Class
Date
1.
Which statement is true regarding endothermic reactions?
a)
a) Temperature change is positive and enthalpy change is positive
b)
b) Temperature change is positive and enthalpy change is negative
c)
c) Temperature change is negative and enthalpy change is positive
d)
d) Temperature change is negative and enthalpy change is negative
2.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
3.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
4.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
5.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

6.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

7.

Endothermic or exothermic reaction: Evaporation of water

a)

Endothermic

b)

Exothermic

8.

Endothermic or exothermic reaction: Fireworks

a)

Endothermic

b)

Exothermic

9.

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

a)

Endothermic

b)

Exotermic

c)

Exothermic

d)

Endotermic

10.

When a new substance forms as a result of a chemical reaction, what type of change has occurred?

a)

Chemical Change

b)

Physical Change

11.

What is the left part of a chemical equation called?

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

12.

What is the right part of a chemical equation called...

2H2 + O2 --> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

13.

True or False

In a chemical reaction, no new atoms are created, and no atoms are destroyed.

a)

TRUE

b)

FALSE

14.

Complete the sentence.


During a chemical reaction, atoms ________.


Completa la oración. Durante una reacción química, los átomos ________.

a)

can appear

b)

can disappear

c)

get rearranged

d)

stop moving and vibrating

15.

Identify the product(s) in the following chemical reaction:


Chromium oxide + Carbon → Chromium + Carbon monoxide

a)

Chromium and carbon.

b)

Chromium and carbon monoxide.

c)

Chromium and carbon dioxide.

d)

Chromium oxide and carbon.

16.

How many iron (Ag) atoms are reactants in this equation?

4Ag + 3O2 → 2Ag2O

a)

4

b)

2

c)

3

d)

0

17.

What is the role of the arrow sign in a chemical reaction?


¿Cuál es el papel del signo de flecha en una reacción química?

a)

Making sure atom counts on each side are the same.

b)

Separating products and reactants.

c)

Showing which substances were in the container first and which substances were added later.

d)

Showing which substances are solids and which are liquids or gases.

18.

In a chemical reaction, the mass of the reactants is 200 grams. Which of the following could represent the mass of the products?

a)

26.6 grams.

b)

200 grams

c)

3.3 grams.

d)

2000 grams.

19.

Which of the following describes the law of conservation of mass?


¿Cuál de los siguientes describe la ley de conservación de la masa?

a)

The mass of the reactants is greater than the mass of the products.

b)

The mass of the products equals the mass of the reactants.

c)

The mass of the products is greater than the mass of the reactants.

d)

The products will have the same states of matter as the reactants.

20.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
21.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
22.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
23.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
24.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
25.

How many F atoms are in this compound?

MgF2

a)

2

b)

6

c)

8

d)

12

26.

Is a copper penny turning greenish after a few years a chemical or physical change?

a)

Chemical Change

b)

Physical Change

27.

How would you describe this chemical formula?
3 H2O

a)

3 H2O molecules

b)

3 H2O atoms

c)

3 H2O elements

d)

3 H2O parts

28.
What are the basic building blocks for all matter?
a)
atoms
b)
elements
c)
compounds
d)
chemicals
29.
What is a molecule?
a)
Two or more atoms bonded together
b)
One element
c)
One atom
d)
Solid, Liquid, Gas
30.
The force that holds 2 atoms together is called a ________________.
a)
Chemical Reaction
b)
Chemical Bond
c)
Diatomic Chemical
d)
Glue
31.
Which of the following is NOT an example of a chemical reaction?
a)
Wood Burning
b)
A cake baking in an oven
c)
Melting Ice Cream
d)
Mixing Vinegar and Baking Soda
32.
How many atoms of Carbon are in one molecule of table sugar (C12H22O11) ?
a)
12
b)
22
c)
11
d)
1

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